全文获取类型
收费全文 | 31907篇 |
免费 | 5040篇 |
国内免费 | 30776篇 |
专业分类
安全科学 | 2780篇 |
废物处理 | 1612篇 |
环保管理 | 2734篇 |
综合类 | 39412篇 |
基础理论 | 5514篇 |
环境理论 | 4篇 |
污染及防治 | 11401篇 |
评价与监测 | 2172篇 |
社会与环境 | 879篇 |
灾害及防治 | 1215篇 |
出版年
2024年 | 22篇 |
2023年 | 363篇 |
2022年 | 1081篇 |
2021年 | 913篇 |
2020年 | 1278篇 |
2019年 | 2470篇 |
2018年 | 2779篇 |
2017年 | 2989篇 |
2016年 | 2924篇 |
2015年 | 3494篇 |
2014年 | 4040篇 |
2013年 | 4833篇 |
2012年 | 4254篇 |
2011年 | 4045篇 |
2010年 | 3382篇 |
2009年 | 3478篇 |
2008年 | 3319篇 |
2007年 | 3117篇 |
2006年 | 2612篇 |
2005年 | 1974篇 |
2004年 | 1586篇 |
2003年 | 1464篇 |
2002年 | 1264篇 |
2001年 | 1182篇 |
2000年 | 1298篇 |
1999年 | 1214篇 |
1998年 | 940篇 |
1997年 | 875篇 |
1996年 | 874篇 |
1995年 | 748篇 |
1994年 | 528篇 |
1993年 | 443篇 |
1992年 | 453篇 |
1991年 | 351篇 |
1990年 | 279篇 |
1989年 | 226篇 |
1988年 | 168篇 |
1987年 | 88篇 |
1986年 | 82篇 |
1985年 | 59篇 |
1984年 | 57篇 |
1983年 | 47篇 |
1982年 | 48篇 |
1981年 | 38篇 |
1978年 | 6篇 |
1976年 | 4篇 |
1975年 | 5篇 |
1974年 | 4篇 |
1972年 | 8篇 |
1971年 | 7篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
Xiao Yali Jiang Dahe Wang Dan 《中国人口.资源与环境(英文版)》2007,5(3):51-56
Urban agglomeration of the Yangtze Delta (UAYD), one of the most developed regions of China, has witnessed an increasing prevalence in building ecological cities when the ecological cities are pursued by many modem cities, and great achievements have been made in this regard. It is inevitable, however, that certain problems exist during the construction of ecological city, which include but not limited to non-harmonious development of urban complex ecosystem, and the difficulty in quantifying eco-city construction or incomplete quantification in assessing the construction of present and future eco-city. Based on the analysis on social-economic conditions and regional conditions of the UAYD, this paper attempts to set up an index system of eco-cities combining with local characteristics, and to adopt the indices of eco-city, urban harmony, and eco-city colligate to evaluate the ecological level, urban harmonious development and eco-city construction of cities within the UAYD. Results indicate that among 15 cities in UAYD, Suzhou City ranks the highest in terms of eco-city construction, whereas Nantong ranks relatively lower; sustainable eco-city construction is possible only when cities are developed in every respect of harmony. 相似文献
32.
With China's rapid economic growth, ecological construction and environmental protection become increasingly important. The regenerated resources industry is an effective way to solve problems, such as resources depletion, energy shortage, and pollution, and it also has strategic importance for the construction of a resource-conserving and environment-friendly society. The regenerated resources industry has been established in Miluo for long time, which includes a recycling system, a processing and utilization system, and a refuse decontamination system. An industrial cluster is in its early stage of development. In order to solve current problems, such as short industrial chain, low processing rate, and low added value, the industrial cluster should be dynamically upgraded by means of technology innovation, chain nucleus creation, and chain extension. We think the industrial cluster of regenerated resources will become a local brand for Miluo, from which other regions or cities will gain valuable experiences and inspirations. 相似文献
33.
详细讨论了卫星遥感技术在长江流域水资源管理方面的应用问题,提出了两种实用的方法:①卫星遥感技术在灌溉水资源管理方面的应用;②长江流域地下水、地表水资源估算。进一步分析了两种方法的特点,介绍了卫星遥感技术的优点及用途,建议在长江流域水资源管理中加以利用。 相似文献
34.
长江中游平原湖区农业开发地域分工与农产品专业化生产研究 总被引:6,自引:1,他引:5
农业生产地域分工与农产品专业化生产是使农业从自然经济阶段向以市场为导向的商品农产品生产转变的一个标志。本文在分析该区农业布局现状及其存在问题的基础上,提出了农业总体布局的设想与不同类型地域农业开发的主攻方向与对策,并对市场经济体制下粮食、棉花、猪、禽、水产品等农产品生产基地的地域选择、建设规模与技术措施等进行了探讨。 相似文献
35.
Dynamics and Causation of Environmental Equity, Locally Unwanted Land Uses, and Neighborhood Changes
Feng Liu 《Environmental management》1997,21(5):643-656
/ Why are some environmental risks distributed disproportionately in the neighborhoods of the minorities and the poor? A hypothesis was proposed in a recent study that market dynamics contributed to the current environmental inequity. That is, locally unwanted land uses (LULUs) make the host communities home to more poor people and people of color. This hypothesis was allegedly supported by a Houston case study, whereby its author analyzed the postsiting changes of the socioeconomic characteristics of the neighborhoods surrounding solid waste facilities. I argue that such an analysis of postsiting changes alone is insufficient to test the causation hypothesis. Instead, I propose a conceptual framework for analysis of environmental equity dynamics and causation. I suggest that the presiting neighborhood dynamics and the characteristics of control neighborhoods be analyzed as the first test for the causation hypothesis. Furthermore, I present theories of neighborhood change and then examine alternative hypotheses that these theories offer for explaining neighborhood changes and for the roles of LULUs in neighborhood changes. These alternative hypotheses should be examined when analyzing the relationship between LULUs and neighborhood changes in a metropolitan area. Using this framework of analysis, I revisited the Houston case. First, I found no evidence that provided support for the hypothesis that the presence of LULUs made the neighborhoods home to more blacks and poor people, contrary to the conclusion made by the previous study. Second, I examined alternative hypotheses for explaining neighborhood changes-invasion-succession, other push forces, and neighborhood life-cycle; the former two might offer better explanation.KEY WORDS: Environmental equity and justice; Locally unwanted lane uses; Siting; Market dynamics; Invasion-succession; Neighborhood changes 相似文献
36.
37.
Lu Jiehua Wang Hongbo & Pan Yi . Institute of Population Research Peking University Beijing China . Department of Sociology University of California at Los Angeles Los Angeles USA. 《中国人口.资源与环境(英文版)》2005,3(1)
INTRODUCTIONIn recent thirty years, due to the decreasing fertility andincreasing life expectancy, China's population is aging ata very rapid pace and the elderly population size is keepingon growing. During the dramatic aging progress, the oldestold group in China is catching our eyes. More and moreold people of China are becoming the oldest old. Theextremely old population (aged 80 and above) is increasingat 5.1% annually, while the old population above 65 isincreasing at 2.9%, and the… 相似文献
38.
Zheng Lei Li Dewen Song Shuzheng Wang Hongtu Sui Jinjun 《Environment, Development and Sustainability》2022,24(3):3110-3125
Environment, Development and Sustainability - In order to reveal the distribution and migration law of downwind and upwind coal cutting, total dust (TD) and respirable dust (RD) concentration... 相似文献
39.
Zhang Yuqing Zhan Chengcheng Wang Hui Gao Ya 《Environment, Development and Sustainability》2022,24(8):9777-9808
Environment, Development and Sustainability - This study analyzes the evolution of the land use structure, demographic reconstruction, and social reconstruction of Dachangshan Island, Changhai... 相似文献
40.
Jiao Youzhou Xue Huizan He Chao Wang Zigang Ma Xiaoran Liu Xinxin Liu Liang Chang Chun Petracchini Francesco Li Panpan 《Environment, Development and Sustainability》2022,24(4):4709-4726
Environment, Development and Sustainability - Anaerobic digestion (AD) is an attractive straw resource treatment technology as it can improve the utilization efficiency of straw resource. Raw straw... 相似文献